package com.mall.interceptor;

import com.mall.constants.JwtClaimsConstant;
import com.mall.context.BaseContext;
import com.mall.properties.JwtProperties;
import com.mall.util.JwtUtil;
import io.jsonwebtoken.Claims;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

/**
 * @author 勾新杰
 * @version 1.0
 * @date 2024/11/22 11:52
 */
@Slf4j
@RequiredArgsConstructor
@Component
public class JwtTokenInterceptor implements HandlerInterceptor {
    private final JwtProperties jwtProperties;

    /**
     * 校验jwt
     *
     * @param request  请求
     * @param response 响应
     * @param handler  处理器
     * @return 是否放行
     * @throws Exception jwt校验异常
     */
    @SuppressWarnings("all")
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("当前线程的id是" + Thread.currentThread().getId());
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }
        //1、从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getTokenHeader());
        //2、校验令牌
        try {
            log.info("jwt校验:{}", token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getSecretKey(), token);
            Long userId = Long.valueOf(claims.get(JwtClaimsConstant.USER_ID).toString());
            log.info("当前用户id：{}",userId);
            BaseContext.setCurrentId(userId);
            //3、通过，放行
            return true;
        } catch (Exception ex) {
            //4、不通过，响应401状态码
            log.error("jwt校验不通过");
            response.setStatus(401);
            return false;
        }
    }
}
